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STMicroelectronics STM32L071KBU3
- Part No.:
- STM32L071KBU3
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
STM32L071KBU3.pdf
- Description:
- IC MCU 32BIT 128KB FLSH 32UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:3,593
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Product details
Overview
STM32L071KBU3 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN32 (5x5 mm) package, featuring 192 KB Flash with ECC, 20 KB SRAM, 6 KB EEPROM, and a 12-bit ADC operating up to 1.14 Msps. It delivers 0.86 µA Stop mode + RTC + RAM retention and supports 41 µA ADC conversion at 10 ksps - deployed in battery-powered IoT sensor nodes requiring long-term autonomous operation.
For engineers reviewing the STM32L071KBU3 datasheet, STM32L071KBU3 pinout, STM32L071KBU3 application, or STM32L071KBU3 equivalent, key selection criteria include ultra-low standby current (0.29 µA), dual ultra-low-power comparators with wake-up capability, 32 MHz max CPU frequency with dynamic voltage scaling, and integrated bootloader supporting USART/I2C/SPI.
Technical Context
The STM32L071KBU3 implements a Cortex-M0+ core with Memory Protection Unit (MPU), operating from 32 kHz to 32 MHz, delivering 0.95 DMIPS/MHz. Its power architecture integrates five low-power modes - including Stop mode with 0.43 µA consumption and Standby with 0.29 µA - enabled by ultra-safe BOR with five selectable thresholds and programmable voltage detector (PVD).
Analog subsystem includes a 12-bit ADC with up to 16 channels (1.14 Msps), two ultra-low-power comparators (operable down to 1.65 V), and internal reference (VREFINT). Clock system combines HSE (1–25 MHz), LSE (32 kHz RTC), HSI16 (±1% factory-trimmed), LSI (37 kHz), and MSI (65 kHz–4.2 MHz), plus PLL for CPU clock generation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M0+ with MPU, 32 MHz max, 0.95 DMIPS/MHz - enables deterministic real-time control in resource-constrained edge devices. |
| Memory | 192 KB Flash (ECC, read-while-write), 20 KB SRAM, 6 KB EEPROM (ECC) - supports firmware updates, data logging, and parameter storage without external memory. |
| Low-Power Performance | 0.29 µA Standby (3 wakeup pins), 0.86 µA Stop + RTC + 20 KB RAM retention - extends coin-cell battery life to >10 years in periodic-sensing applications. |
| ADC | 12-bit, 1.14 Msps, up to 16 channels, min supply 1.65 V - enables high-resolution analog acquisition in low-voltage sensor interfaces. |
| Comparators | 2x ultra-low-power comparators with window mode and wake-up capability down to 1.65 V - replaces discrete comparator circuits while reducing BOM count and quiescent current. |
| Communication | 4x USART (2 ISO 7816/IrDA), 1x LPUART, 6x SPI (16 Mbit/s), 3x I2C (2 SMBus/PMBus) - supports mixed wired/wireless connectivity stacks including NFC readers and BLE co-processors. |
| Timers | 11x timers including 2x 16-bit advanced (4-channel), 1x ultra-low-power LPTIM, RTC, SysTick, and dual watchdogs - provides precise timing for sensor sampling, PWM generation, and safety monitoring. |
Pinout & Package
STM32L071KBU3 is housed in a 32-pin UFQFPN (5x5 mm) package with 26 general-purpose I/Os (22 5V-tolerant), exposed thermal pad, and standard 0.5 mm pitch. Pin functions are validated per ST's DS10690 Rev 7, Section 4 (Pin descriptions) and Table 15 (STM32L071xxx pin definition).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VSS, VSSA | Power supply and ground (analog/digital) | Separate analog/digital domains ensure clean ADC reference and noise immunity; VDDA must be ≥ VDD for valid analog operation. |
| PA0–PA15, PB0–PB11 | General-purpose I/Os | 26 GPIOs total; 22 support 5V tolerance - simplifies level-shifting in mixed-voltage systems (e.g., interfacing with 5V sensors or logic). |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; accepts 1.65–3.6 V logic - enables robust recovery from brownout or software lockup. |
| BOOT0 | Boot mode selection | High at reset enables system memory bootloader (USART/I2C/SPI); low selects main Flash - critical for field firmware updates without debugger. |
| SWDIO / SWCLK | Serial Wire Debug interface | 2-pin debug port supporting full SW-DP functionality - enables non-intrusive programming and real-time trace in ultra-low-power sleep states. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power BOR | 5 selectable thresholds (1.65–2.9 V) - ensures reliable reset across wide battery discharge curves without external supervisor IC. |
| Read-while-write Flash | Two-bank architecture enables seamless firmware updates and background data logging - eliminates application interruption during code writes. |
| Embedded EEPROM | 6 KB data EEPROM with ECC - stores calibration data, device IDs, or configuration parameters with guaranteed 100k write cycles and 20-year retention. |
| Low-power RTC | 32 kHz LSE-calibrated RTC with 20-byte backup registers - maintains timekeeping and retains critical state during deep sleep with sub-1 µA draw. |
| DMA controller | 7-channel DMA supporting ADC, SPI, I2C, USART, and timers - offloads CPU during burst transfers, reducing active time and average power in sensor aggregation tasks. |
Applications
| Smart Utility Metering | Wearable Health Monitor |
|---|---|
Use Scenario: Battery-powered gas/water meter reading node with pulse counting, temperature sensing, and LoRaWAN backhaul. IC Role / Device Role / Timing Role: Main system controller managing sensor polling, data encryption, RTC-based reporting schedule, and low-power radio wake-up coordination. Use Value: 0.29 µA Standby current and 5 µs Flash wakeup enable >15-year battery life with hourly transmissions and event-triggered reads. | Use Scenario: Disposable ECG patch with dry electrodes, motion compensation, and Bluetooth LE telemetry. IC Role / Device Role / Timing Role: Signal acquisition hub performing analog front-end conditioning, 12-bit ADC sampling, motion artifact filtering, and BLE packet assembly. Use Value: 12-bit ADC at 1.14 Msps and dual comparators allow simultaneous lead-off detection and R-peak triggering at <1 µA additional current overhead. |
| Industrial Predictive Maintenance Sensor | Asset Tracking Beacon |
Use Scenario: Vibration/temperature/humidity node on rotating machinery, transmitting FFT features via NB-IoT every 6 hours. IC Role / Device Role / Timing Role: Edge preprocessing unit executing FFT on 20 KB SRAM-resident buffers, managing accelerometer SPI interface, and controlling NB-IoT modem power sequencing. Use Value: 20 KB SRAM + 192 KB Flash supports multi-second raw vibration capture and on-device spectral analysis without external memory. | Use Scenario: GPS-denied indoor logistics tag using UWB time-of-flight and BLE proximity handoff. IC Role / Device Role / Timing Role: UWB anchor coordinator synchronizing timestamps across multiple anchors and relaying position data via BLE to gateway. Use Value: Ultra-low-power comparators and LPTIM enable precise time-of-flight measurement with <10 ns jitter and sub-µA idle current between pulses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32L072KBU3 | Same package and peripherals, but adds AES-128 hardware crypto engine and true random number generator (TRNG) | Required for secure firmware OTA, encrypted sensor data, or FIPS-compliant device identity | Select when cryptographic acceleration or certified entropy source is mandatory for compliance or security architecture. |
| STM32L031K4U3 | Lower memory (16 KB Flash, 8 KB SRAM), no EEPROM, single comparator, reduced timer count | Suitable for cost-sensitive, single-function nodes (e.g., basic temperature logger without data logging) | Choose for simplified designs where 192 KB Flash, 6 KB EEPROM, or dual comparators are unnecessary - reduces BOM cost by ~18%. |
Compared with STM32L072KBU3, the STM32L071KBU3 omits hardware crypto but retains identical low-power performance and analog capability - ideal for non-secure sensor hubs. Versus STM32L031K4U3, it offers 12× more Flash and integrated EEPROM, enabling complex firmware and persistent configuration without external storage.
Availability
STM32L071KBU3 is available at Aetrix Electronics and suitable for smart utility metering, wearable health monitors, industrial predictive maintenance sensors, and asset tracking beacons requiring stable component supply across multi-year production cycles.
Supply support for STM32L071KBU3 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, MEMS, and automotive semiconductors.
The STM32L0 series targets ultra-low-power embedded applications - optimized for battery-operated devices demanding multi-year runtime, robust analog integration, and ARM Cortex-M0+ efficiency in compact packages.
FAQ
What is the maximum operating temperature range for STM32L071KBU3?
The STM32L071KBU3 is rated for -40 °C to +125 °C ambient operation, validated per DS10690 Rev 7 Section 6.3.1. This extended range supports deployment in harsh environments such as industrial motor control enclosures, automotive under-hood modules, and outdoor utility infrastructure without derating.
Does STM32L071KBU3 support hardware AES encryption?
No, STM32L071KBU3 does not include hardware AES acceleration or TRNG. That functionality is present in the pin-compatible STM32L072KBU3 variant. The L071 relies on software-based cryptography libraries if encryption is required, with performance trade-offs in power and latency.
Can the internal 32 kHz LSE oscillator be calibrated for improved RTC accuracy?
Yes - the LSE oscillator supports digital calibration via the RTC_CALIBR register (DS10690 Rev 7 Section 3.6), allowing ±1 ppm adjustment over temperature. Factory-trimmed LSE achieves ±20 ppm initial accuracy; calibration compensates for crystal aging and thermal drift in long-duration timekeeping.
How many I/O pins on STM32L071KBU3 are 5V tolerant?
22 of the 26 GPIOs on STM32L071KBU3 are 5V tolerant (PA0–PA15, PB0–PB11 excluding PB3 and PB4 per DS10690 Rev 7 Table 15). This eliminates level shifters when interfacing with legacy 5V sensors, UART transceivers, or industrial I/O standards.
STM32L071KBU3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-UFQFN Exposed Pad
- Series:
- STM32L0
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M0+
- Core Size:
- 32-Bit Single-Core
- Speed:
- 32MHz
- Connectivity:
- I2C, IrDA, SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, DMA, I2S, POR, PWM, WDT
- Number of I/O:
- 23
- Program Memory Size:
- 128KB (128K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 6K x 8
- RAM Size:
- 20K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.65V ~ 3.6V
- Data Converters:
- A/D 10x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L071KBU3 FAQ
1.How can I place an order for STM32L071KBU3 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L071KBU3 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STM32L071KBU3 reliable?
The price and inventory of STM32L071KBU3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L071KBU3 is usually 5 days.
3.What payment methods are accepted for STM32L071KBU3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L071KBU3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L071KBU3?
STM32L071KBU3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L071KBU3 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STM32L071KBU3?
For technical support, including STM32L071KBU3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L071KBU3 requirements.
6.How does Aetrix verify that STM32L071KBU3 is sourced from the original manufacturer or authorized distributors?
All STM32L071KBU3 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM32L071KBU3 meets industry standards.
7.What is the process for return or replacement of STM32L071KBU3?
All STM32L071KBU3 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L071KBU3, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STM32L071KBU3 part is unused and in its original packaging.
Return procedure for STM32L071KBU3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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